This is the Internet, you know; therefore you shouldn't take anything anyone says personally.
Anyway, while I don't have a direct answer to your question, I have some ideas. You could inject the new sound over something that isn't used (tree stump), redirect the "ambience countryday" (or whatever it's called) index reference to the new sound, and mess with the looping sound data (although that's mostly untouched data).
It'd be easier to look up the guy who did the level Temple from Goldeneye on Blood Gulch. That had the James Bond theme song playing, and it looped pretty well. Maybe he could tell you how he did it. It's probably still over on the files section at Halomods. Good luck.
how can you adjust the audio for them because its so light you can barely hear the new explosions
anyone?
worked perfectly thanks